Cisco Catalyst ME3400 switch is a switch usually used at the service provider end.
Although it is a Catalyst many things are different compared to the regular Catalyst
switches.
The ME3400 has three different port types:
UNI – User Network Interface. Port downstream (towards customer). Port can’t run STP,
CDP or Etherchannel protocols like PAgP and LACP.
ENI – Enhanced Network Interface. ENIs have the same functionality as UNIs, but can be configured to support protocol control packets for Cisco Discovery Protocol (CDP), Spanning-Tree Protocol (STP), Link Layer Discovery Protocol (LLDP), and EtherChannel Link Aggregation Control Protocol (LACP) or Port Aggregation Protocol (PAgP).
NNI – Network Node Interface. Sometimes also called network to network interface. This port
is facing upstream towards the core. This port has support for STP, CDP and Etherchannel
protocols.
Note: The default state for a UNI or ENI is administratively down to prevent unauthorized users from gaining access to other ports as you configure the switch. Traffic is not switched between these ports, and all arriving traffic at UNIs or ENIs must leave on NNIs to prevent a user from gaining access to another user's private network. If it is appropriate for two or more UNIs or ENIs to exchange traffic within the switch, the UNIs and ENIs can be assigned to a community VLAN.
Although it is a Catalyst many things are different compared to the regular Catalyst
switches.
The ME3400 has three different port types:
UNI – User Network Interface. Port downstream (towards customer). Port can’t run STP,
CDP or Etherchannel protocols like PAgP and LACP.
ENI – Enhanced Network Interface. ENIs have the same functionality as UNIs, but can be configured to support protocol control packets for Cisco Discovery Protocol (CDP), Spanning-Tree Protocol (STP), Link Layer Discovery Protocol (LLDP), and EtherChannel Link Aggregation Control Protocol (LACP) or Port Aggregation Protocol (PAgP).
NNI – Network Node Interface. Sometimes also called network to network interface. This port
is facing upstream towards the core. This port has support for STP, CDP and Etherchannel
protocols.
Note: The default state for a UNI or ENI is administratively down to prevent unauthorized users from gaining access to other ports as you configure the switch. Traffic is not switched between these ports, and all arriving traffic at UNIs or ENIs must leave on NNIs to prevent a user from gaining access to another user's private network. If it is appropriate for two or more UNIs or ENIs to exchange traffic within the switch, the UNIs and ENIs can be assigned to a community VLAN.
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